Good question! And it applies to other places as well: in Newfoundland and in the Canadian eastern Arctic, accordian is very much the prominent instrument; in Cape Breton and Prince Edward Island, and in the rest of the Maritimes, accordian is not particularly common. In Quebec, accordian is right up there with fiddle, while in Ontario and western Canada, it tends to be associated with communities of central/eastern/southern European ethnicities, much less so with the 'mainstream' Anglo/Celt/French.